wifi: iwlwifi: fw: avoid using an uninitialized variable

iwl_fwrt_read_err_table can return true also when it failed to read
the memory. In this case, err_id argument is not initialized,
but the callers are still using it.

Simply initialize it to 0. If the error table was read successfully it'll
be overridden.

Fixes: 43e0b2ada5 ("wifi: iwlwifi: fw: add an error table status getter")
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Link: https://patch.msgid.link/20250209143303.37cdbba4eb56.I95fe9bd95303b8179f946766558a9f15f4fe254c@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

drivers/net/wireless/intel/iwlwifi/fw/dump.c

@@ -540,6 +540,9 @@ bool iwl_fwrt_read_err_table(struct iwl_trans *trans, u32 base, u32 *err_id)
 	} err_info = {};
 	int ret;
 
+	if (err_id)
+		*err_id = 0;
+
 	if (!base)
 		return false;